ubuntu20.04.6에서 Docker설치 사용하기

이전 버전 삭제하기
Docker Apt 저장소 설정하기
Docker설치하기
Docker hello-world

이전 버전 삭제하기

다음 명령으로 설치되어있는 docker관련 이전 패키지를 삭제합니다.

for pkg in docker.io docker-doc docker-compose podman-docker containerd runc; do sudo apt-get remove $pkg; done

Docker Apt 저장소 설정하기

sudo apt update

sudo apt-get install ca-certificates curl gnupg

sudo install -m 0755 -d /etc/apt/keyrings

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg

sudo chmod a+r /etc/apt/keyrings/docker.gpg

echo "deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu "$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

cat /etc/apt/sources.list.d/docker.list

deb [arch=amd64 signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu   focal stable

sudo apt-get update

Docker설치하기

sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

sudo systemctl status docker

현재 유저가 sudo명령 없이 관리자 권한으로 실행할 수 있도록 설합니다.

sudo usermod -aG docker ${USER}

다시 로그인하여 그룹을 확익하면 추가된 docker그룹을 확인할 수 있습니다.

groups

ubuntu adm cdrom sudo dip plugdev lxd docker

Docker hello-world

다음과 같이 Docker Hub에서 이미지에 액세스하고 다운로드해 봅니다.

docker run hello-world

Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
719385e32844: Pull complete
Digest: sha256:4f53e2564790c8e7856ec08e384732aa38dc43c52f02952483e3f003afbf23db
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
    (amd64)
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://hub.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/get-started/

docker images

REPOSITORY    TAG       IMAGE ID       CREATED        SIZE
hello-world   latest    9c7a54a9a43c   5 months ago   13.3kB